What is 32 bit and 64 bit?

what is 32 bit and 64 bit? How do they differ? kindly help me
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  1. the 64 bit version of an OS can utilize more System memory for starters,
    Here is a link to MS's info:
    http://windows.microsoft.com/en-US/windows7/32-bit-and-64-bit-Windows-frequently-asked-questions
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